BRD2 and hepatocellular carcinoma: Among the HCC proteome subtypes and NAT, the C1 subtype exhibited the highest expression of three candidate proteins: exportin 1 (XPO1), regulation of nuclear pre‐mRNA domain‐containing protein 1b (RPRD1B), and ras‐related nuclear protein (RAN) (p < .0001, Figure 5B).